Pulse signal generation method and apparatus
AssigneeHirose Electric Co., Ltd.
InventorsAkihiro Gotoh, Shoji Oyama, Tomoaki Ito
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Abstract
A pulse signal generator comprises a magnetic element capable of causing a large Barkhausen jump, a detector provided in relation to the magnetic element, a magnetic field source provided in the vicinity of the magnetic element to produce a biasing magnetic field which causes a predetermined magnetization of the magnetic element, and a magnetic circuit forming member provided in the vicinity of the magnetic element to produce a main magnetic field which cause a large Barkhausen jump in the magnetic element such that movement of the object to be detected changes the main magnetic field of the magnetic circuit forming member thereby causing a large Barkhausen jump to provide a pulse signal.
Claims15
A method for generating a pulse signal with a magnetic element capable of causing a large Barkhausen jump, comprising the steps of:
- applying to said magnetic element a magnetic field for causing a predetermined magnetization of said magnetic element;
- and
- providing a magnetic circuit forming member for forming a magnetic circuit via an object made of a magnetic substance to be detected to change said magnetic field upon said magnetic element in response to movement of said object, thereby causing a large Barkhausen jump in said magnetic element to provide a pulse signal.
A method for generating a pulse signal with a magnetic element capable of causing a large Barkhausen jump, comprising the steps of:
- applying to said magnetic element a magnetic field for causing a predetermined magnetization of said magnetic element;
- and
- providing a magnetic circuit forming member stationary with respect to said magnetic element for changing said magnetic field upon said magnetic element in response to movement of an object made of a magnetic substance, thereby causing a large Barkhausen jump in said magnetic element to provide a pulse signal.
A pulse signal generator, comprising:
- a magnetic element capable of causing a large Barkhausen jump;
- a detector provided in relation to said magnetic element;
- a magnetic field generating means provided in vicinity of said magnetic element for applying a biasing magnetic field which causes a predetermined magnetization of said magnetic element;
- magnetic circuit forming means provided in vicinity of said magnetic element for producing a main magnetic field which causes a large Barkhausen jump in said magnetic element;
- and
- said magnetic circuit forming means forming a magnetic circuit via an object made of a magnetic substance to be detected and having a magnetic path such that said main magnetic field is changed by change of reluctance of said magnetic path caused by movement of said object, thus causing a large Barkhausen jump in said magnetic element.
A pulse signal generator, comprising:
- a magnetic element capable of causing a large Barkhausen jump;
- a detector provided in relation to said magnetic element;
- a magnetic field generating means provided in vicinity of said magnetic element for applying a biasing magnetic field which causes a predetermined magnetization of said magnetic element;
- magnetic circuit forming means provided in vicinity of said magnetic element for producing a main magnetic field which causes a large Barkhausen jump in said magnetic element;
- and
- said magnetic circuit forming means provided fixedly with respect to said magnetic element and having a magnetic path, reluctance of said magnetic path being changed by an object made of a magnetic substance to be detected so that said main magnetic field is changed by change of said reluctance to produce a large Barkhausen jump in said magnetic element.
Dependencies are inferred from the claim text.